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Last modified
1/26/2010 4:34:40 PM
Creation date
4/3/2008 10:03:38 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.10.B
Description
2004 Annual Operating Plan
Basin
Colorado Mainstem
Author
USDOI/BOR
Title
2004 Annual Operating Plan for Colorado River Systems
Water Supply Pro - Doc Type
Operating Principles/Plan
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<br />January 7, 2004 17 <br />Storage Project Act, the 1968 Colorado River Basin Project Act, and the 1992 Grand Canyon <br />Protection Act. Reservoir releases in excess of powerplant capacity required for dam safety <br />purposes during high reservoir conditions may be used to accomplish the objectives of the <br />Beach/Habitat Building Flow according to the terms contained in the Glen Canyon Dam ROD, and <br />as published in the Glen Canyon Dam Operating Criteria (62 Federal Register 9447, Mar. 3, 1997). <br /> <br />Daily and hourly releases in 2004 will be made according to the parameters of the ROD for the Glen <br />Canyon Dam Final Environmental Impact Statement (GCDFEIS) preferred alternative and the Glen <br />Canyon Dam Operating Criteria, as shown in Table 3. Exceptions to these parameters may be made <br />during power system emergencies, or for purposes of humanitarian search and rescue. Experimental <br />flows implemented in 2004 will also require that releases exceed the parameters of the Glen Canyon <br />Dam Operating Criteria during the winter months of 2004. <br /> <br />Table 3. Glen Canyon Dam Release Restrictions (Glen Canyon Dam 0 )erating Criteria) <br /> Parameter (cfs) (cms) Conditions <br />Maximum flow (3) 25,000 708.0 <br />Minimum flow 5,000 141.6 Nighttime <br /> 8,000 226.6 7:00 am to <br />. 7:00 pm <br />Ramp rates <br />Ascending 4,000 113.3 per hour <br />Descending 1,500 42.5 per hour <br />Daily fluctuations (2) 5,000 / 8,000 141.6/226.6 <br /> <br />Releases from Lake Powell in water year 2004 will continue to reflect consideration ofthe uses and <br />purposes identified in the authorizing legislation for Glen Canyon Dam. Powerplant releases and <br />Beach/Habitat Building Flows will reflect criteria based on the findings, conclusions, and <br />recommendations made in the ROD for the GCDFEIS pursuant to the Grand Canyon Protection Act <br />of 1992, and NEP A documentation regarding the April 24, 2002, AMWG experimental flow <br />proposal. <br /> <br /> <br />(I) May be exceeded during beach/habitat building flows, habitat maintenance flows, or when <br />necessary to manage above average hydrologic conditions. <br /> <br />(2) Daily fluctuations limit is 5,000 cfs (141.6 cms) for months with release volumes less than <br />0.600 maf(740 mcm); 6,000 cfs (169.9 cms) for monthly release volumes of 0.600 to 0.800 maf <br />(740 to 987 mcm); and 8,000 cfs (226.6 cms) for monthly volumes over 0.800 maf(990 mcm). <br /> <br />
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